Throttle check valves

In throttle check valves the compressed air has free passage in one flow direction. In the reverse direction, however, the flow can be adjusted by an adjustable spindle, until complete closure is achieved. This means that the speed of the piston movement can be accurately adjusted.
Type A: supply air throttled from P - A for single-acting cylinders
Type B: exhaust air throttled from A - P for double-acting cylinders